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dc.contributor.author
Brites Helú, Mariela Alicia  
dc.contributor.author
Bonazza, Horacio  
dc.contributor.author
Fernandez, Jose Luis  
dc.date.available
2019-02-01T14:31:31Z  
dc.date.issued
2016-08  
dc.identifier.citation
Brites Helú, Mariela Alicia; Bonazza, Horacio; Fernandez, Jose Luis; Sensing electroadsorption reactions and surface mobility of electroadsorbed species by scanning electrochemical induced desorption; Elsevier Science Sa; Journal of Electroanalytical Chemistry; 775; 8-2016; 64-71  
dc.identifier.issn
1572-6657  
dc.identifier.uri
http://hdl.handle.net/11336/69171  
dc.description.abstract
A theoretical analysis of electro-adsorption reactions and of the surface diffusion of electro-adsorbed species based on scanning electrochemical microscopy (SECM) in the feedback mode, usually known as scanning electrochemical induced desorption (SECMID), is presented. Numerical simulations of the classical feedback process were carried out by including in the model a potential-dependent electro-adsorption reaction from the mediator at the substrate and allowing the adsorbed species (Aad) to diffuse over the substrate surface affecting the mediator loop. As in classical SECMID, the local variation of the mediator concentration underneath the tip causes a potential-dependent gradient of the Aad surface coverage at the substrate over the tip-affected region, which drives the Aad surface diffusion toward this area and the consequent positive feedback of mediator, reaching a steady state. The simulated steady-state dependences of the tip current (iT) on the substrate potential (ES) show the presence of a peak over the potential range affected by the electro-adsorption reaction, whose amplitude at a given tip-substrate distance is mostly influenced by the surface diffusion coefficient of Aad and the density of adsorption sites at the substrate. When this surface process is parallel to an electrode reaction of the mediator that proceeds over the same potential range, the adsorption/diffusion peak is overlapped with the typical Butler-Volmer type response of the electrode reaction, affecting the iT(ES) shape and interfering with the determination of kinetic parameters from this dependence. These phenomena were experimentally observed when using the H+/H2 mediator loop on Au and Pt, where Had is electro-adsorbed from H+, a process that in the case of Pt is parallel to the oxidation of the tip generated H2.  
dc.format
application/pdf  
dc.language.iso
eng  
dc.publisher
Elsevier Science Sa  
dc.rights
info:eu-repo/semantics/openAccess  
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/  
dc.subject
Electro-Adsorption  
dc.subject
Hydrogen Adsorption  
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Secm  
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Surface Diffusion  
dc.subject.classification
Otras Ciencias Químicas  
dc.subject.classification
Ciencias Químicas  
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CIENCIAS NATURALES Y EXACTAS  
dc.title
Sensing electroadsorption reactions and surface mobility of electroadsorbed species by scanning electrochemical induced desorption  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2019-01-22T18:51:14Z  
dc.journal.volume
775  
dc.journal.pagination
64-71  
dc.journal.pais
Países Bajos  
dc.journal.ciudad
Amsterdam  
dc.description.fil
Fil: Brites Helú, Mariela Alicia. Universidad Nacional del Litoral. Facultad de Ingeniería Química. Programa de Electroquímica Aplicada e Ingeniería Electroquímica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe; Argentina  
dc.description.fil
Fil: Bonazza, Horacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe; Argentina. Universidad Nacional del Litoral. Facultad de Ingeniería Química. Programa de Electroquímica Aplicada e Ingeniería Electroquímica; Argentina  
dc.description.fil
Fil: Fernandez, Jose Luis. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe; Argentina. Universidad Nacional del Litoral. Facultad de Ingeniería Química. Programa de Electroquímica Aplicada e Ingeniería Electroquímica; Argentina  
dc.journal.title
Journal of Electroanalytical Chemistry  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://doi.org/10.1016/j.jelechem.2016.05.031  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S1572665716302624